Introduction to stacking of switches
一、The concept of Exchange stacking：
A combination of multiple switchboard devices that support stacking, logically forming a single switching device. As shown below, the switch A and SwitchB are connected by stacked cables to form a stack iStack. for upstream and downstream devices, they are equivalent to a switch switch.
二、what concepts are involved in the stack of switches?
1, the role
All single switches in stack are called member switches. They can be divided into three roles according to their functions.
A, master switch
The Master is responsible for managing the entire stack. There is only one main switch in the stack.
B, standby switch
The standby switch (Standby) is a backup switch of the main switch. When the main switch fails, the switching opportunity takes over all the services of the primary switch. There is only one standby switch in the stack.
C, from the switch
The Slave is mainly used for service forwarding. The more the number of switches, the stronger the forwarding capacity of the stack system. In addition to the main switch and the standby switch, all the other member switches in the stack are from the switch.
2, stacked ID
Stacked ID, the Slot ID of a member switch, is used to identify and manage member switches. Stack ID of all member switches in the stack is unique.
3, stacking priority
Stacking priority is an attribute of a member switch, which is mainly used to determine the role of a member switch during role election. The greater the priority value is, the higher the priority is, the higher the priority is, the greater the possibility of being elected to the switch.
三、the benefits of stack exchange;
1. High reliability. The stacking system supports the link aggregation function of cross-devices and realizes the cross-device link redundant backup. 2, powerful network expansion ability. By increasing the number of ports, bandwidth and processing capability of the stack system, the member switch can be easily expanded, and the new member switch can automatically synchronize the configuration file and system software version of the main switch. 3. Simplify configuration and management. On the one hand, users can log on to the stack system through any member switch, and all members of the stack system can be configured and managed uniformly; on the other hand, after stacking is formed, There is no need to configure complex layer 2 broken ring protocol and three layer protection switching protocol, which simplifies network configuration.
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